<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 内容主体区域 -->
    <el-card>
      <el-alert
        title="注意：只允许为第三级分类设置相关参数"
        type="warning"
        show-icon
        :closable="false"
      >
      </el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!--  选择分类的级联选择器 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="cateList"
            :props="cateListProps"
            @change="handleChange"
            clearable
          ></el-cascader>
        </el-col>
      </el-row>
      <!-- tab标签页区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <el-tab-pane label="动态参数" name="many">
          <el-button
            @click="addDialogVisible = true"
            :disabled="isBtnDisabled"
            type="primary"
            size="mini"
            >添加参数</el-button
          >
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开列 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag
                  closable
                  @close="handelClose(index, scope.row)"
                  :key="index"
                  v-for="(item, index) in scope.row.attr_vals"
                  >{{ item }}</el-tag
                >
                <!-- 添加Tag标签的按钮 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column
              label="参数名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  @click="showEditDialog(scope.row.attr_id)"
                  icon="el-icon-edit"
                  type="primary"
                  size="mini"
                  >编辑</el-button
                >
                <el-button
                  @click="removeParamsById(scope.row.attr_id)"
                  icon="el-icon-delete"
                  type="danger"
                  size="mini"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <el-tab-pane label="静态属性" name="only">
          <el-button
            @click="addDialogVisible = true"
            :disabled="isBtnDisabled"
            type="primary"
            size="mini"
            >添加属性</el-button
          >
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开列 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag
                  closable
                  @close="handelClose(index, scope.row)"
                  :key="index"
                  v-for="(item, index) in scope.row.attr_vals"
                  >{{ item }}</el-tag
                >
                <!-- 添加Tag标签的按钮 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column
              label="属性名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  @click="showEditDialog(scope.row.attr_id)"
                  icon="el-icon-edit"
                  type="primary"
                  size="mini"
                  >编辑</el-button
                >
                <el-button
                  @click="removeParamsById(scope.row.attr_id)"
                  icon="el-icon-delete"
                  type="danger"
                  size="mini"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加参数对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClose"
    >
      <!-- 添加参数表单 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改参数对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClose"
    >
      <!-- 修改参数表单 -->
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 所有商品分类信息
      cateList: [],
      // 级联选择器当前选中的项目ID数组
      selectedCateKeys: [],
      // 级联选择器配置对象
      cateListProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // tab当前被选中的name值
      activeName: 'many',
      // 动态参数的数据
      manyTableData: [],
      // 静态属性的数据
      onlyTableData: [],
      // 控制添加参数对话框的显示
      addDialogVisible: false,
      // 添加参数表单对象
      addForm: {
        attr_name: ''
      },
      // 添加参数表单验证规则对象
      addFormRules: {
        attr_name: [
          {
            required: true,
            message: '请输入参数名称',
            trigger: 'blur'
          }
        ]
      },
      // 控制修改参数对话框的显示
      editDialogVisible: false,
      // 修改参数的表单数据对象
      editForm: {},
      // 修改参数的表单验证规则
      editFormRules: {
        attr_name: [
          {
            required: true,
            message: '请输入参数名称',
            trigger: 'blur'
          }
        ]
      },
      // 添加tag标签的输入框的显示
      inputVisible: false,
      // 添加tag标签的输入框的内容
      inputValue: ''
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败')
      }
      this.cateList = res.data
    },
    // 当级联选择器选中项别改变时触发
    async handleChange() {
      this.getParamsData()
    },
    // 当tab页切换时
    handleTabClick() {
      this.getParamsData()
    },
    // 获取参数列表数据
    async getParamsData() {
      console.log(this.selectedCateKeys)
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        {
          params: { sel: this.activeName }
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      // 把attr_vals里面的字符串数据分割成一个数组
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        item.inputVisible = false
        item.inputValue = ''
      })
      console.log(res.data)
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 当添加参数对话框被关闭时
    addDialogClose() {
      this.$refs.addFormRef.resetFields()
    },
    // 添加参数对话框点击确定事件
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return 0
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          }
        )
        if (res.meta.status !== 201) {
          return this.$message.error(res.meta.msg)
        }
        this.$message.success(res.meta.msg)
        this.getParamsData()
        this.addDialogVisible = false
      })
    },
    // 修改参数对话框被关闭时
    editDialogClose() {},
    // 点击编辑按钮
    async showEditDialog(attrId) {
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attrId}`,
        {
          params: {
            attr_sel: this.activeName
          }
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 点击修改参数对话框中的确定按钮
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return 0
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error(res.meta.msg)
        }
        this.$message.success(res.meta.msg)
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 根据ID删除对应参数
    removeParamsById(attrId) {
      this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      })
        .then(async () => {
          const { data: res } = await this.$http.delete(
            `categories/${this.cateId}/attributes/${attrId}`
          )
          if (res.meta.status !== 200) {
            return this.$message.error(res.meta.msg)
          }
          this.$message.success(res.meta.msg)
          this.getParamsData()
        })
        .catch(() => {
          this.$message.info('已取消删除操作')
        })
    },
    // 当添加tag标签的输入框失去焦点或者按下Enter键就触发
    handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        // 说明用户没有输入有效数据
        row.inputValue = ''
        row.inputVisible = false
        return 0
      }
      // 说明输入了有效数据
      row.attr_vals.push(row.inputValue)
      this.saveAttrVals(row)
    },
    // 点击添加tag标签按钮触发
    showInput(row) {
      row.inputVisible = true
      // $nextTick方法可以在页面重新渲染之后执行函数体内的代码
      this.$nextTick(() => {
        this.$refs.saveTagInput.focus()
      })
      // this.$mount(console.log(this.$refs.saveTagInput))
    },
    // 把修改保存到数据库的方法封装起来
    async saveAttrVals(row) {
      const { data: res } = await this.$http.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败')
      }
      row.inputValue = ''
      row.inputVisible = false
      this.$message.success('修改参数项成功')
    },
    // 点击参数tag关闭按钮的时候
    handelClose(index, row) {
      row.attr_vals.splice(index, 1)
      this.saveAttrVals(row)
    }
  },
  computed: {
    // 用来计算是否需要禁用按钮
    isBtnDisabled() {
      // 如果按钮需要被禁用，则返回true
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 用来返回当前选中的项目ID
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 返回当前选中的页签的名字
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      } else {
        return '静态属性'
      }
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin-top: 15px;
}
.el-cascader {
  width: 30vw;
}
.el-tag {
  margin: 5px;
}
.input-new-tag,
.button-new-tag {
  margin: 5px;
}
.input-new-tag {
  width: 120px;
}
</style>
